Re: determining who is a registered user in your system

From: Adam Aube (aaube01_at_baker.edu)
Date: 11/26/04

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    To: debian-user@lists.debian.org
Date: Fri, 26 Nov 2004 12:00:44 -0500

    Antonio Rodriguez wrote:
    > Adam Aube wrote
    >> Antonio Rodriguez wrote:

    >>> Whats the command to determine who is a registered user in your
    >>> system, or to gather stats about them, such as registration time, etc?

    >> What do you mean by "registered user"?

    > Good question, hmm, the ones that you can unregister with deluser?
    > Ls-ing /etc/passwd you can see a bunch of entries.

    So you mean system users (those with accounts in /etc/passwd) as opposed to
    virtual users (users that only exist in some service's user database).

    > Some are system users, necessary for the functioning of the default
    > minimal system, some are not.

    > Would be great having a command that would spit that out:

    AFAIK, there is no such command. However, users created by tools such as
    adduser start at UID 1000, so anything with a lower UID was either a
    default account created at install time or created by a software package,
    and should not be touched without good reason.

    > Can the root remove h[i,e][m,r]self from the system?

    Of course - just remove the entries from /etc/passwd and /etc/shadow.
    However, I would strongly recommend you NOT do this (unless you want to
    cripple your system).

    Adam 

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